Answer:
Explanation:
The number of protons is considered as the atomic number of the element in the periodic table
when leadii nitrate solution is added to sodium bromide solution, solid leadii bromide forms and sodium nitrate solution remains. be sure to include the state of each reactant and product in the equation.
Pb[tex](NO_{3} )_{2}_{(aq)}[/tex] + 2NaBr[tex]_{(aq)\\}[/tex] → Pb[tex]Br_{2}_{(s)}[/tex] + 2[tex]NaNO_{3}_{(aq)}[/tex]
Lead nitrate solution is added to sodium bromide solution, which results in the formation of solid lead nitrate and the retention of sodium nitrate solution.
Ensure that the equation takes into account the states of each reactant and product. Sodium bromide with Lead (II) Nitrate
Here, lead(II) nitrate (Pb(NO3)2) is combined with sodium bromide (NaBr). White precipitate is the end result.
What occurs when sodium bromide solution is mixed with silver nitrate solution?Salt bromide with silver nitrate
Here, silver nitrate is combined with sodium bromide (NaBr) (AgNO3). White precipitate is the end result.
When potassium bromide and lead ii nitrate are combined, does a precipitate form?The lead(II) bromide precipitate is produced by the reaction between solely the lead(II) ions and bromide ions. Before and after, separate potassium and nitrate ions are present.
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what determines the period and the group on the periodic table ?
Answer:
Members of the same group in the table have the same number of electrons in the outermost shells of their atoms and form bonds of the same type.
Explanation:
What is substance in your own words?
when 1.85 g of na2co3•nh2o reacts with an excess of acid 0.457 g of carbon dioxide is formed. what is the value of n? round to the nearest whole number.
Value of n is NaCO3: 0.103/0.07= 1.47 and
h2o: 0.07/0.07= 1.
What is a mole?Mole, also spelled mol, in chemistry, standard scientific unit for measuring large quantities of very small entities such as atoms, molecules, or other specified particles.
The mole designates an extremely the large number of units, 6.02214076 × . The mole was previously defined as number of atoms determined experimentally to be found in 12 grams of carbon-12.
The number of units in a mole also bears name Avogadro’s number, or Avogadro’s constant,
The number of atoms or the other particles in a mole is the same for all substances. The mole is related to mass of an element in the following way: one mole of carbon-12 atoms has 6.02214076 × atoms and a mass of 12 grams.
In comparison, one mole of oxygen consists, by definition, of same number of atoms as carbon-12, but it has a mass of 15.999 grams. Oxygen, therefore, has greater mass than carbon. This reasoning also can be applied to the molecular or formula weights.
The mass of anhydrous NaCO3 representing CO2 production is calculated:
m NaCO3 = 0.457*(106 NaCO3/ 44g co2)= 1.10g
Mass of water is calculated:
m h2o =1.85g-0.457= 1.393g
Moles of each component are calculated:
n NaCO3= 1.10/106 = 0.103 mol
n h2o = 1.393/18 = 0.07 mol
They are divided by smallest:
NaCO3: 0.103/0.07= 1.47
h2o: 0.07/0.07= 1
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why ammonia is highly soluble in water?
Answer:
yes
Explanation:
please take to 8 glasses of water everyday
Which features form along all types of plate boundaries?
faults
rift valleys
mountains
ocean ridges
According to the research, the correct options are faults and mountains. These are features form along all types of plate boundaries.
What are plate boundaries?They are the contact areas of the lithosphere between plates, we call them boundaries or edges, where new oceanic crust is formed and in which the plates separate, there are three plate boundaries which are:
ConvergentDivergentTransform plateIn this sense, since they are areas of great geological activity, they have a varied topography since tensional forces are produced that cause their movement that forms mountains and fault blocks.
Therefore, we can conclude that according to the research, the correct options are faults and mountains. These are features form along all types of plate boundaries.
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Answer:
A
Explanation:
Why is there no reaction with the following; Aluminium oxide + copper
Student wants to try to convince your parents to stop serving piece for dinner she lays an argument peas are high in fructose which is a type of sugar which test could she use to provide scientific evidence to support her argument that Peas are high in fructose
Benedict's test should be done to prove it.
Glucose is the main sugar which is mainly found in our blood. it is present in carbohydrate products. People with fructose intolerance should avoid peas because it contain a lot of fructose
Benedict's test is a test where chemicals are used to check the presence of sugar in a particular substance. The sugar that is present in the substance will react with the reducing sugar present in the substance on heating. the positive result is shown by the colour change from clear blue to brick red precipitate.
Pea contains a lot of fructose and it can be proved by doing benedict test.
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The student filters and dries the precipitate of CaCO, (molar mass 100.1g/mol) and records the data in the table
below.
Volume of Na₂CO3 solution
50.0 mL
Volume of 1.0 M Ca(NO3), added
Mass of CaCO3 precipitate collected
100.0 mL
0.93 g
(c) Determine the number of moles of Na2CO, in the original 50.0mL of solution.
(d) The student realizes that the precipitate was not completely dried and claims that as a result, the calculated
Na₂CO, molarity is too low. Do you agree with the student's claim? Justify your answer.
(e) After the precipitate forms and is filtered, the liquid that passed through the filter is tested to see if it can conduct
electricity. What would be observed? Justify your answer.
(c)The number of moles of Na₂CO₃ , in the original 50ml of solution is 0.0093 moles Na₂CO₃ is present.
(d) Disagree, if grams of CaCO₃ is inflated by being wet Na₂CO₃ is inflated and inflating the molarity value.
(e) After the precipitate form and is filtered, the soluble spectator ions removed. I expect that the filtrate conduct electricity.
The balanced equation is given by :
Na₂CO₃ + Ca(NO₃)₂ -------> CaCO₃ + 2NaNO₃
(c) no. of moles of Na₂CO₃ = ?
mole of Ca(NO₃)₂ = 100 ml = 0.1 L × 1mol/L = 0.1 moles of Ca(NO₃)₂
moles of CaCO₃ formed = mass / molar mass
= 0.93 g / 100 g/mol
= 0.0093 mols
from reaction it is clear that , Na₂CO₃ and Ca(NO₃)₂ is in 1:1 ,
one mole CaCO₃ obtain from 1 mole of Na₂CO₃
so, no. of moles Na₂CO₃ is originally present originally:
= 0.0093 moles CaCO₃ × 1 moles of Na₂CO₃ / 1mol CaCO₃
= 0.0093 moles Na₂CO₃ is present.
(d) Disagree, if grams of CaCO₃ is inflated by being wet Na₂CO₃ is inflated and inflating the molarity value.
(e) After the precipitate form and is filtered, the soluble spectator ions removed. I expect that the filtrate conduct electricity.
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complete the paragraph to describe binary systems
A binary star system is made of stars, two of which is brighter than the other.
Astronomers are able to detect the dimmer star because its gravity causes the bright star to wobble
Astronomers can also spot the dimmer star by observing a phenomenon called a(n) eclipsing binary. This happens when the dim star passes in front of the bright star.
When one astronomical body is obscured by another or when a body moves between it and the observer, this is known as an eclipse.Partial solar eclipses can be seen if you are in the moon's penumbra during a solar eclipse. Solar eclipses happen when the sun is partially blocked by the moon.When the sun, moon, and earth align, the earth covers the moon's view of the sun, causing lunar eclipses.To know more about eclipses visit : https://brainly.com/question/12075389
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please help!! 10 points + brainlist!!
Answer:
concentrated=strong
dilute=weak
Write out the reaction that destroys ozone in the stratosphere.
The reaction that destroys ozone in the stratosphere is [tex]3Cl_2 + 2O_3 --- > 6ClO[/tex]
Ozone layer depletionThe ozone layer is a stratospheric layer that shields the planet from harmful radiations coming from the sun. A type of UV radiation known as UVB is known to cause harmful effects on plants and animals, including humans.
The ozone layer is destroyed by halogen-based pollutants such as chlorofluorocarbon (CFC). When these pollutants are exposed to intense UV radiation at the stratospheric layer, they release halogens.
For example, CFC releases chlorine when exposed to intense UV radiation. Chlorine molecules are capable of reacting with ozone to form chlorine monoxide (ClO) according to the following equation:
[tex]3Cl_2 + 2O_3 --- > 6ClO[/tex]
Thus, the stratospheric ozone layer is gradually removed by chlorine.
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The reaction of cr2o3 with silicon metal at high temperatures will make chromium metal. True or false?.
The reaction of Cr₂o₃ with silicon metal at high temperatures will make chromium metal.
The given statement is true.
This reaction shows the formation of Cr when Cr₂O₃ reacts with silicon metal which signifies that chromium metal is formed
2 Cr₂O₃ (s) + 3Si (s) ------> 4Cr (l) + 3SiO₂ (s)
40.47 g of Si and 146.00 g of Cr₂O₃ will be used to produce 1.921 mol of Chromium.
This reaction would give liquid Chromium metal, which isn't the pure form of metal.
Pure Chromium metal can be obtained from the thermal reduction of Cr₂O₃ with aluminum.
Cr₂O₃(s) + 2Al(l) --> 2Cr(l) + Al₂O₃(s)
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Ammonia is made up of two pure substances: nitrogen and hydrogen. What
can be true for ammonia, nitrogen, and hydrogen?
1.Ammonia is a mixture, and nitrogen and hydrogen are elements.
2.Ammonia is a mixture, and nitrogen and hydrogen are compounds.
3.Ammonia is a compound, and nitrogen and hydrogen are elements.
4.Ammonia is an element, and nitrogen and hydrogen are compounds.
Answer:
3.Ammonia is a compound, and nitrogen and hydrogen are elements.
Explanation:
Look up the differences between elements, compounds and mixtures.
need some help with people problems anybody up for it?
The Covid-19 pandemic has raised awareness of a situation that can be surprisingly unpleasant for many people: asking for help. From practical difficulties, like finding someone to do your food shopping, to emotional ones, like dealing with anxiety and sadness alone.
Problems with mental health do not resolve themselves. Treatment and recovery may be more challenging the longer an illness lasts. When anxiety and trauma are not addressed, they can both worsen and result in panic episodes and post-traumatic stress disorder. an incapacity to handle issues or regular tasks. a sense of detachment or disconnect from daily activity imaginative or unusual thinking. excessive worry persistent melancholy, depression, or apathy.
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The table shows the solubility of two substances in water at 20 °C.
Solubility of Substances
Mass
(kg) Solubility of Sodium Chloride
(g per 100 g of water) Solubility of Lead Nitrate
(g per 100 g of water)
100 L K
200 36 54
Part 1: What will be the values of L and K for 100 kg of each substance?
Part 2: Explain your answer for Part 1.
K and L values for each substance are 108g and 18g, respectively.
What is solubility?Solubility is the formation of a new bond between solute molecules and solvent molecules. Solubility is the maximum concentration of solute that dissolves in a known concentration of solvent at a given temperature in terms of quantity.
We calculated the solubility of NaCl in 100g of water to be 36g.
Lead Nitrate solubility in 100g water = 54g
Determine the value of L:-
200Kg sodium chloride solubility = 36g
100kg Sodium chloride Solubility = [tex]\frac{36g}{100kg} *200kg[/tex] = 18g
Determine the value of K:-
100Kg Lead Nitrate Solubility = 54g
200kg Lead Nitrate Solubility = [tex]\frac{54g}{100kg} *200kg[/tex] = 108g
Solubility difference = solubility of K - solubility of L
Solubility difference = 108g - 18g = 90g
Thus, the 108g and 18g, are the values for K and L respectively.
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One gram of sodium chloride will take longer to dissolve in a solution of 2 m glucose than in a solution of pure water. What is the most reasonable explanation for this observation?.
The most reasonable explanation is, sodium chloride and Water are both polar compounds while Glucose is nonpolar.
Since glucose is a non-polar compound while NaCl is polar, we know that polar compounds will dissolve in polar solvents while non-polar compounds will dissolve in non-polar ones. H2O also dissolves NaCl but not glucose because it is a polar molecule.
Due to their bonds with elements like nitrogen, oxygen, or sulfur, polar compounds have distinct zones of positive and negative charge.
Non-polar covalent compounds, on the other hand, are those in which there is no change in electronegativity. In these compounds, the electronegativity does not change, preventing the motion of the bond pair's electrons in the direction of the linked atoms.
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how many moles of tin are in 2.01 x 10^23 atoms of tin?
Using Avogadro’s number, 0.33 moles of tin are present.
The number of particles (atoms or molecules) in each mole of a material is known as the Avogadro’s number. It's represented with a symbol [tex]N_A[/tex].
Avogadro's number of molecules of that substance make up one mole of an atom, according to the mole concept.
1 mole = 6.02 x [tex]10^2^3[/tex] atoms
Given:
No. of atoms of tin = 2.01 x [tex]10^2^3[/tex]
Avogadro’s number, [tex]N_A[/tex]= 6.02 x [tex]10^2^3[/tex]
To find:
No. of moles, n = ?
Formula:
n = No. of atoms of tin / Avogadro’s number
Calculations:
n = 2.01 x [tex]10^2^3[/tex] / 6.02 x [tex]10^2^3[/tex]
n = 2.01 / 6.02
n = 0.33 moles
Result:
The number of moles present in 2.01 x [tex]10^2^3[/tex] atoms of tin is 0.33 moles
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One gram of sodium chloride will take longer to dissolve in a solution of 2 m glucose than in a solution of pure water. What is the most reasonable explanation for this observation?.
The most reasonable explanation is, Sodium chloride and Water are both polar compounds while Glucose is nonpolar.
Since glucose is a non-polar compound while NaCl is polar, we know that polar compounds will dissolve in polar solvents while non-polar compounds will dissolve in non-polar ones. water also dissolves NaCl but not glucose because it is a polar molecule.
Due to their bonds with elements like nitrogen, oxygen, or sulfur, polar compounds have distinct zones of positive and negative charge.
Non-polar covalent compounds, on the other hand, are those in which there is no change in electronegativity. In these compounds, the electronegativity does not change, preventing the motion of the bond pair's electrons in the direction of the linked atoms.
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The ocean floor is largely made of______ formed by magma from earth’s mantle that cools and hardens
The ocean floor is largely made of Volcanic rock formed by magma from earth’s mantle that cools and hardens.
What is ocean floor called?The ocean's bottom is referred to as the seabed, seafloor, ocean floor, and ocean bottom. All oceanic floors are referred to as "seabeds." The various types of sediment that make up practically the whole ocean floor include mud, sand, and gravel.
What materials compose the ocean floor?Deposits of minerals we need every day, such copper, zinc, nickel, gold, silver, and phosphorous, can be found on the seafloor. These deposits are nodules on silt from the abyssal plain that are typically 3 to 10 centimetres (1 to 4 inches) in diameter and appear as crusts on volcanic and other rocks.
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A student in a lab measured the mass of 380 ml of regular coca cola and the mass of 380 ml of diet coca cola. He found the mass of regular coca cola to be 384 g, and the mass of diet coca cola to be 370g. What physical property of both drinks can you calculate based on the data obtained in experiment 1?.
The physical property of both drinks that we can calculate based on the data obtained is density
The density formula and the procedure we will use is:
d = m/v
Where:
v= volumed= densitym= massInformation about the problem:
v(regular coca cola)= 380 mlm(regular coca cola)= 384 gv(diet coca cola)= 380 mlm(diet coca cola)=370 gd(diet coca cola)= ?d(regular coca cola)= ?Applying the density formula, we get:
d(regular coca cola) = m(regular coca cola)/v(regular coca cola)
d(regular coca cola) = 384 g / 380 ml
d(regular coca cola) = 1.0105 g/ml
d(diet coca cola) = m(diet coca cola)/v(diet coca cola)
d(diet coca cola) = 370 g / 380 ml
d(diet coca cola) = 0.9737 g/ml
What is density?It is a physical quantity that expresses the ratio of the body mass to the volume it occupies.
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Put these steps of solar system formation in order.
X
A solar nebula forms.
Intro
The solar nebula flattens
into a disk.
Gravity pulls the solar
nebula upon itself.
Gas becomes hot and
dense and forms a star.
The solar nebula spins
faster and faster.
Done
Order of solar system :
1. A solar nebula develops.
3. The solar nebula is pulled in on itself by gravity.
5. The solar nebula continues to rotate quickly.
2. The solar nebula becomes flat and forms a disk.
4. Gas turns hot and dense and develops into a star.
What are the features of Solar Nebula?It is a cloud with a disc shape.
It is made up of the gas and dust left over after the sun forms.
The following are the steps involved in the creation of the solar system:
A solar nebula first appears after the sun is formed.
In the subsequent stage, gravity uses its force to pull the nebula toward it.
This force causes the nebula to travel too swiftly.
Gravity causes the nebula to spin quickly, giving it the appearance of a disc.
Finally, this disc-shaped nebula's temperature rises, making the gases inside it hot and heavy.
This results in a "star" (ball of fire) being produced in the end.
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The complete question is:
Put these steps of solar system formation in order.
1) A solar nebula forms.
2) The solar nebula flattens into disk
3) gravity pulls the solar nebula upon itself
4) gas becomes hot and dense and forms a star
5) the solar nebula spins faster and faster
A 101.96 g sample of a solid is broken down into 53.96 g of aluminum and an unknown amount of
oxygen. if a chemist wants to make 1,937 grams of that solid without any leftovers, how much aluminum
and oxygen should she react together?
1025 g of aluminum with 912.0 g of oxygen should she react together.
What do aluminum and oxygen have in common?Aluminum oxide, with the chemical formula Al₂O₃, is a chemical compound composed of aluminum and oxygen.Aluminum oxide or Alumina (Al2O3) is formed when aluminum (Al) is exposed to air. Aluminum turns silver white and greyish in appearance. Answer: It simply reacts with atmospheric oxygen to form a protective aluminum oxide sheath that prevents corrosion.Aluminum has a strong affinity for oxygen. When a new aluminum surface is exposed to air or another oxidizing agent, a thin, hard film of aluminum oxide forms quickly (or hydrated oxide in non-stagnant water). This oxidation of aluminum is precisely what makes aluminum corrosion resistant.Only trace amounts of aluminum that you may inhale, ingest, or come into contact with on your skin will enter your bloodstream. Aluminum exposure is usually not harmful, but excessive exposure can be harmful to your health.To learn more about aluminum and oxygen refer to
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1. This is the process where fossil fuels, forests, or other carbon-containing substances are burned, adding more carbon dioxide to the air. 2. A reaction in which a substance reacts with oxygen gas, releasing energy in the form of light and heat. Example: 1. Burning coal in a factory, cars burning gasoline, a forest fire.
Combustion is the process where fossil fuels, forests, or other carbon-containing substances are burned, adding more carbon dioxide to the air.
Combustion is a reaction in which a substance reacts with oxygen gas, releasing energy in the form of light and heat.
What is combustion?Combustion is a type of chemical reaction that occurs between fuel and oxygen leading to the production or generation of light and heat as a form of energy.
Examples of combustion reactions include the following:
The reaction between butane and oxygen leading to the production of water and carbondioxide.The reaction between methanol and oxygen to yield carbondioxide and water with energy.The reaction between propane and oxygen to yield carbondioxide and water with energy.The reaction between ethane and oxygen to yield carbondioxide and water with energy.Therefore, the question is a correct definition of a type of reaction called the combustion reaction.
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The half-life of cesium-137 is 30.2 years. if the initial mass of a sample of cesium-137 is 1.00kg, how much will remain after 151 years?
0.03125 kg/31.25 g will remain after 151 years.
How long does cesium stay in the body?Cesium-137 is significant due to its prevalence, relatively long half-life (30 years), and potential health effects. As it decays to the barium isotope, Ba-137m (half-life = 2.6 minutes), cesium-137 emits beta particles.Caesium-137 (Cs-137) is a dangerous and toxic radioisotope with a relatively long half-life of 30.17 years that emits beta and gamma rays. Caesium-137 radioisotope can be found in nuclear waste as a fission product in nuclear reactors or as a fallout from nuclear power plantsCs-135 has a half-life of 2,300,000 years, making it primarily a concern for the long-term performance of the disposal system. Cs-137 has a half-life of 30.08 years, making it a concern for storage, transfers, transportation, as well as the preclosure and handling phases of disposal.A reaction's half-life is the time it takes for the reactant concentration to fall to one-half of its initial value. The half-life of a first-order reaction is a constant that is proportional to the rate constant: t1/2 = 0.693/k.The "reserve" contains plutonium-239, which has pollinated a hundred-kilometer zone around the Chernobyl nuclear power plant, according to experts. It has a half-life of 24,000 years.To learn more about cesium-137 refer to
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Nickel forms a square planar complex with that has a charge of. What is the coordination number and oxidation state of the nickel atom?
Answer: 4
Explanation:
sodas typically contain flavorings, coloring agents, sugar, and carbon dioxide dissolved in water. the best term to describe this mixture would be . view available hint(s)
Sodas typically contain flavorings, coloring agents, sugar, and carbon dioxide dissolved in water, so the best term to describe this would be aqueous solution.
What are Aqueous solutions?Aqueous solutions are the solutions that contain liquid water in them as the solvent that is used to dissolve the various solutes.
When we mix this sugar, flavorings, coloring agents, and carbon dioxide together, we have the aqueous solution of soda.
The word aqueous, which is derived from the Greek aqua, denotes that it is dissolved in or related to water.
It is shown in chemical equations by adding (aq) to the relevant chemical formula.
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Complete Question
Sodas typically contain sugar, flavorings, coloring agents, and carbon dioxide dissolved in water. The best term to describe this mixture would be _____.
A) an aqueous solvent
B) an aqueous solution
C) a solution
D) a solvent
E) a solute
explain breifly why the 1st ionization energy of "B" is less than of "Be" less than of the atomic number of "B" is greater than that of "Be"
Explanation:
B → Boron → Atomic number 5
Be → beryllium → Atomic number 4
B - Hybridization → 1S² 2S² 2P¹
[tex] \sf Boron - \boxed{↿↾} \: \boxed{↿↾} \: \boxed{ \small↾ }\huge\boxed{ }\huge\boxed{ }[/tex]
Be - Hybridization → 1S² 2S²
[tex] \sf Beryllium →\boxed{↿↾} \: \boxed{↿↾} \: \huge\boxed{ }\huge\boxed{ }\huge\boxed{ }[/tex]
from above data we can see that the outermost orbital of Beryllium i.e. 2S is fully filled & that of boron have 1 electron in 2P orbital. It will require more energy to remove one electron from beryllium Because it will disturb the stability, on other hand the boron will lose one electron easily to attain full filled outermost electron hence it will require less energy for 1st ionization.
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What would be most beneficial towards maintaining equilibrium probably be him in an eco system over a long period of time
The most beneficial towards maintaining the equilibrium in an ecosystem over a long period of time is to Diversity of organism.
A ecosystem maintains equilibrium by ensuring that each organism has resources and proper living condition fort the survival. four factors balance an ecosystem is water cycle, mineral cycle, energy flow and community dynamics. An ecosystem is place where plants and other organism interact with nonliving factor like weather.
Biodiversity or biological diversity , refers to all the variety of life that exist on earth. our planet is full of variety of living organisms .An ecosystem must have the greatest amount of producers, followed by primary consumers and having smallest no. of tertiary consumers.
hence,The most beneficial towards maintaining the equilibrium in an ecosystem over a long period of time is to Diversity of organism.
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Put the following elements into the correct order from smallest to largest radius. Al, Ga,
Br, I
From Smallest to Largest:
Br
I
Al
Ga